Property & Equipment Depreciation Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Property And Equipment [Abstract]
Depreciation Expense	$ 6.2	$ 5.8	$ 18.2	$ 17.2
Depreciation Expense Recorded in Cost of Sales	$ 0.7	$ 1.1	$ 2.3	$ 3.7